dired: -l: -o/-g OK too; mention dired-local-variables-file more

[Dan Jacobson]

$ zpcregrep -i 'must .*\bl\b'  /usr/share/emacs/22.0.92/lisp/dired.el.gz
  "*Switches passed to `ls' for Dired.  MUST contain the `l' option.
       (read-string "ls switches (must contain -l): " dired-actual-switches))

Oh yeah? Well my

$ cat noeuerduesbeueroeug/.dired
Local Variables:
dired-actual-switches: "-og"
End:

doesn't. P.S.,

   s runs the command dired-sort-toggle-or-edit

   Toggle between sort by date/name and refresh the dired buffer.
   With a prefix argument you can edit the current listing switches
   instead.

Please also mention

   You can even set them per-directory with a
   dired-local-variables-file.

Else years will go by without users knowing about it. And perhaps give
my above example. Mention dired-local-variables-file in more places
because it is great.